The present disclosure relates to diesel fuel emulsions, a process to make them and the use thereof in a combustion process. The emulsions are comprise a surfactant of formula wherein R is a C5-C22 linear or branched, saturated or non-saturated, substituted or unsubstituted hydrocarbon group, A is or CH2, each X, independently, is H, COOM or SO3M, with at least one X in the molecule being COOM or SO3M, each R2, independently, is H, CH3, or C2H5, k=0-3, each m, independently, is about 2-6, each n, independently, is about 1-6 and the alkylene formed when n>1 may be substituted with alkyl groups, o=0-40, and each M, independently, is selected from H and any cation M+.